Add a scroll-to-top button for better navigation

[ak-0283]

Description:
Currently, the website lacks a scroll-to-top button, which affects user navigation, especially when browsing through long pages. Adding a scroll button will improve the user experience by enabling them to quickly return to the top of the page without manually scrolling back.

Steps to reproduce the issue:

1. Open the website.
2. Scroll down on a long page.
3. Notice that there is no option to quickly scroll back to the top.

Expected behavior:
A scroll-to-top button should appear after the user scrolls a certain distance down the page. Clicking on the button should smoothly scroll the page back to the top.

View Bug

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[github-actions]

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